Lawyer’s brain

A man went to a brain store to get some brain for dinner. He sees a sign remarking on the quality of professional brain offered at this particular brain store. So he asks the butcher:
How much for engineer brain?
Three dollars for one hundred grams.
How much for doctor brain?
Four dollars for one hundred grams.
How much for lawyer brain?
One hundred dollars for fifty grams.
Why is lawyer brain so much more?
Do you know how many lawyes you need to kill to get once ounce of brain?